Scale.



w. w. BOYD.

- scm. APPLICATION FILED JULY 5.1917. 1,325,188. Patented Dec. 16,1919.

'5 Fig.1 4

' I! v I J I In I 1 5 j 3 Z0 6 i 79 M @m nvenfw:

STATES PATENT OFFICE.

WILLIAJM. WALLAtJE BOYD, OF BUFFALO, NEW YtIBK, ASSIGHCiB. TO BUFI'ALbSCALE I v OF BUFFALO, NEW YORK, A CORPORATION OF NEW YORK.

SCALE.

Specmmtion qt Letters Patent. Patented Dec. 16, 1919.

Application filed m a, 1911. Serial no. 179,0.

useful Improvements in Scales, of whichthe following is a specification.

This invention relates to scales and more particularly to the typewhichare used for weighing heavy ob ects like auto trucks,

railroad cars and the like. 7 One of the objects of this invention is toprovide a coupling or oomiector between the' pair of Iongitudinal leversgenerally known as end levers and the single transverse .leverconneoting with the steelyard generally known as a cross lever, whichcoupling'willpermit of transmitting'the movement from this pair oflevers to the single 1m; with a minimum of friction and under a comression strain and-with an action which self tion, not liable to get outof order and caqcorresponding parts throughout the" '50 pable of beingproduced at comparatively low cost. In the accompanying drawings; 1Figure 1 is a. side elevation partl-y in tion, showing my improvementsapplied to a pair of longitudinal or end levers and a. single crosslever of a scale. Fig. 2 is a. fragmentar vertical transverse section ofthe same. ig. 3 is a vertical longitudinal section taken on line 3-3,Fig. 2. Fight is a vertical transverse section taken on thecorrespondingly numbered line in Fig. 1. Fig. 5 is a. perspective viewof one of the sections of the strut or yoke forming Fig. "(i is aslmilar view of one of the hearmy improvements. n a v Similar charactersof reference. views. v 1, 1- represent a pair of longitudinal levers ofa. scale which arearra 7 each: othe see- ' bearing part of; the couplingwhich contains my invention.

'14 h-. wise in line and have their. on seams g r,. These leversfarcommit-". 3;

known in the'trade as end levels andore operatively connected with'tlieplatform of the'scale so that the free opposing'ends of these lovers aredepressed when the load is placed upon the platform. 2- represents a'singlelever arranged transversely below the opposing ends of the, end-levers, this lever being oommonl known in the trade as a cross lever.he same is -so mounted that it is depressed by'theend', levers andtransmits motion to the scale beam b means of an upright steelyard inthe usual and well known manner.

My invention resides in the means wherehy the motion of theend levers istransmltted to the cross lever and in their preferred form these meansare constructed as follows: f p

'3 represents t'wo nose pieces or irons one of which is arranged on thefree end of each end lever so as to'pro ect laterally from oppositesides thereof. ach of these nose irons is preferably mounted on itsres'pectivelever by providing the upper part of the nose iron with anopening which resolves the lever, and a set screw 4 arranged verselvthereto and has its opposite ends projeotlng from opposite sides of therespective nose iron. Each of thwe upper knife edges ispreferably'secured in its nose iron by casting the latter upon thisknife edge so'as-to' provide downwardly facing surfaces on the undersideof-this knife edge at opposite 'ends thereof.

. 6, 6' represent two pairs of upper bearing blocks the members of eachpair being arranged with their upper sides below the hearin faces atopposite ends of one of the upper mifcedges'and each of these blockshaving fa conven underside or hearing face 7 which is curvedtransversely or about an axiswhich is parallel with the length of I'theand levers. Each of 7 these upper bearisfpfr'ovided"with a concaveupwhieh is preferably curved or ahoutnn axis transthe la ngthof the endlevers. In

IZQYi with. when. ng.piece 8 r "fiahiirdened preferably of.fiiihstentially dove-tail form and seated in a correspondingly shapedrecess 9 formed transversely bears against the adjacent lower art of thead]aoent upper knife edge.

' its innercnd each of these wearing pieces is arranged transverscl 1 ispreferably provided with a point or pro jeotion 1'0 which is adapted toengage the adjacent vertical surface of the respective nose piece oriron and thereby reduce to a minimum the friction between these parts ifthey should come into engagement with each other during the Working ofthe scale.

On the cross lever is arraned a lower knife ed e 11 which is preferablymounted thereongy castin this leveron the same, this being refera lyeffected by castin this lever on tl iis knife edge, so that the atterthereto or parallel with the end levers an so that the ends of thisknife edge form two upwardly facing bearing surfaces on opposite sidesof the On the central part cross lever.

12, 12 represent a pair of lower bearing blocks which are arranged onopposite sides of the cross lever and each provided on its undersidewith a curved face which is arranged the lower knife edge and is curvedabout an axis which is transversely of the cross lever or arallel withthe end levers. The upper and of each lower bearing block is provi edwith a. convex bearing face which is curved about an axis arrangedparallel with the cross lever or at right angles to the end levers. ofthe lower face of each lower bearing block the same is provided with awearing iece 13 which is preferably constructed of hardened and groundsteel and of dove-tail form and seated in a correspondingly'shapcdrecess 14 formed in the lower face of this block and extending in adirection transversely of the cross lever or len hwise of the endlevers. The lower su ace of each of the wearing pieces of each lowerbearing block is preferably flush with the lower face of the respectiveblock and at its inner end the same is provided with a oint orprojection 15 forming a friction w iich is ada ted to engage with theadjacent vertical side of the cross lever and thereby reduce to aminimum the area of contact between these parts when they come into oncut with each other. I

Between the upper and lower bearing blocks is arranged a strut or yokewhich is adapted to transmit motion from the end levers to the crosslever by pressure. In the preferred form of this strut the samecomprisesgtwo upright'scctions 16 16 which are arranged transversely ofthe end levers wise of the cross lever on oppoand lengt site sidesof'the latter. Eachof these strut flush with the upper surface of thisabove the upper side of one end of i on the upper strut in a levers inresponse 'to the pressumfwlnch is sections or members is provided at itsupper end on o'posite sides of one of the end levers witi two upwardlyfacing concave seats 17, 17 each of which is curved about an axis whichis parallel with the end levers and engages with the lower convex faceof one of the corresponding pair of upper bearing blocks. Centrally onits lower end each of the strut sections or members is, provided with adownwardly facing lower concave bearing face 18 which is curved about anaxis arranged transversely of .the end levers and parallel with thecross lever and engages with the upper convex face of one of the lowerbearing blocks. The two sections or members of the strut are preferablyconnected with each otherjby a tie so that they practicall form onepiece and move in unison. in various ways, that shown in the drawingsbeing suitable for this purpose and comprising an externally screwthreaded tie rod 19 which is arranged horizontally and lengthwise of theend levdrs and passes through corresponding openings in the centralparts of the strut sections and two pairs of clampmg screw nuts 20,applied to this tie rod, the members of each pair bearing againstopposite sides of one of the strut sections, as best shown'in Fig. 3.By'shif ting these This connection may be effected may be adjusted tobring their upper and lower bearing surfaces into the roper positionrelative to the bearing blocks with which they cooperate.

In order" to hold blocks against fdisplacement on its r8 tive strutsection the same is provided ii i the central part of its convex facewith a retaining pin 21 which is secured at one end in a recess 22 inthe respective bearing block while its opposite end projects beyond theconvex face of the same and into a retainin recess 23 formed centrallyin the correspcnlf ing' concave bearing surface .of the respective strutsection;

When the end levers each of the hearing this movement is transrfilttedby the upper and lower bearin bloc and the strut to the cross lever sollhat the latter turns about its axis at right angles to that of the andlevers. Duringjthis movement the and levers rock upon the upper bearingblocks, the cross lever rocks upon the lower bearin blocks, and theupper bearing blocks r0 ends of the strut in a direction transwersely ofthe end levers and thefllower bearing blocks rock on the lower endsof'the direction lengthwiseiof ,the end exerted u on these members. Bythis means the mom rs which are subjected. to"com-' pression strainswhile transmittingmotion from the end levers to tlhccross lever autoaredepressed by a load imposed upon the platform of the scale Ill v tivebearing b which is imposed upon this cou ling is there- .forefullysustained while at t e same time reducing to a minimum the frictionbetween block.

matically aline themselves into the proper sition for enabling the upperand lower nife ed to age fully with the res cgee fie at all times. The ldiid the several members which transmit the mo- .tion of the end, leversto the cross lever, 'thereby obtaining the maximum sensitive- 11688 1nthe operatiomof the scale. It is therefore possible by the use of thisconling between ,the end levers and the cross ever'to materiallyincrease the accuracy of the scale without weakening the same orinvolving any material increase in cost of construction.

I claim as my invention:

. 1.-'In a scale, the combination of two longitudinal levers havingtheir ends opranged below the ends of said longitudinal levers,'and 'acoupling for connecting said longitudinal and transverse leverscomprising nose irons arranged respectively on the ends of saidlongitudinal levers and each provided with an upper transverse knifeedge projecting laterally from opposite sides of the respectivelongitudinal lever, two upper bearing blocks arranged on opposite sidesof each longitudinal lever and each provided with an upper face engagingthe adjacent lower part of the upper knife edge and having a lowerconvex face which is curved transversely, an upright strut provided withtwo pairs of upper concave faces each of whichis curved transverse] andengages the convex face of one of said upper bearing blocks and saidstrut being also rovided with two lower concave faces 'whic 1 arearranged on opposite sides of the transverse lever and each of which iscurved lengthwise, two lower bearin blocks arranged on opposite sides ofsaid transverse lever and each having a convex upper face which iscurved lengthwise and engages with one of the lower .concave faces ofthe strut and each lower bearing block'also hav.- ing a lower face, anda lower longitudinal knife edge arranged on the transverse lever andhaving its ends arranged on opposite sides of the said lower lever andeach of said ends engaging its upper side with the lower face of theadjacent lower bearing -2.'I n a scale, the combination of twolongitudinal levers having their ends op- .posln each other, atransverse lever arrange below the ends of said longitudinal levers, anda coupling for connecting said longitudinal and transverse leverscomprisoi nose ironsarran-ed res ectivel on the ends ofsaid-longitudinal ev rs and each provided with an up transverse knifewedge projecting lateral y fromopposite sides and said strut-being alsorovided with two lower concave faces whic are arranged on opposite sidesof the transverse lever and each of which is curved lenlgthwise, two

lower bearing blocks arrange on o posite sides of said transverse leverand eac having a convex upper face which is curved lengthwise andengages with one of the lower concave faces of the strut and each lowerhearing block also having a lower face and a lower longitudinal knifeedge ar-- ranged on the transverse lever and havin its ends arranged onop ositesides of sai transverse lever and c1151 gagin its upper sidewith the lower face of the a jacent' lower bearing block, each of saidbearing blocks being provided in its convex face with a retaining in andthe strut beingprovided in each 0 its concave faces with 'a recess whichreceives the retaining pin of the adjacent bearing block.

3. In a scale, the combination of two longitudinalylevers having theirends opposing each other, a transverse lever arranged below the ends ofsaid longitudinal levers, and a coupling for connecting saidlongitudinal and transverse levers comprismg nose irons arrangedrespectively on the ends of said longitudinal levers and each providedwith an upper transverse knife edge projecting laterally from op ositcsides of the respective longitudinal ever, two upper bearingblocks'arranged on opposite sides of each longitudinal lever and eachprovided with sin-upper concave face oposite the adjacent lower part ofthe upper nife edge and havinga lower convex face which is curvedtransversely, an upright strut provided with two pairs of upper concavefaces each of which is-curved transversely and engages the convex faceof one of said upper bearing blocks and said strut being also rovidedwithtwo lower concave faces whic are arranged on op osite sides of thetransverse lever and eac is curved lengthwise, two lower bearin blocksarranged on opposite sides of sai transverse lever and each having aconvex upper-face which is curved lengthwise and engages with one of thelower concave faces nal knife edge arranged on the transverse lever andhaving its ends arranged on opof said ends en-.'

of which.

posite sides of said transverse lever and each of said ends enga 'ng itsupper side with the concave lower ace of the adjacent lower bearingblock, each of said bearing blocks being provided on its concave facewith a wearing piece which engages with the adjacent part of therespectiveknife edge.

4. In a scale, the combination of two ion gitudinal levers having theirends opposing each other, a transverse lever arranged below the ends .ofsaid longitudinal levers, and a coupling for connecting saidlongitudinal and transverse levers comprising nose irons arranged resctively on the ends. of said 5 longitudinal evers and each (providedwith an upper transverse knife e ge pro ect1ng laterally from o positesides of the respective longitudina lever, two upper bearing blocksarran ed on opposite sides of each o'longitudinal ever and each providedwith an upper concave face posite the adjacent lower part of the upperrnife edge and haw ing a lower convex face which s curved transversely,an upright strut provided with two pairs of upper concave faces each ofwhich is curved transversel and engages the convex face of one of sai( u)per bearing blocksand said strut bein a so provided with two lowerconcave Ewes which are l0 arranged on opposite sides of the transverselever and each of which is curved lengthwise, two lower bearing blocksarranged on opposite sides of said transverse lever and each having aconvex upper face which is curved lengthwise and engages with one of thelower concave faces of the strut and each lower bearing block also havina lower concave face which is curved transversely, and a lowerlongitudinal knife edge arranged onthe transverse lever and having itsends arranged on opposite sides of said transverse lever and each ofsaid ends on ing its upper side with the convex lower Ed e of theadjacent lower hearing block,

46 each of said bearing blocks being provided in its concave face with adove-tail recess and a dove-tail-wearing piece arranged in said recessand engaging with the adjacent part of the respective knife edge.

60 5. Ina scale, the combination of two iongitudinal levers having theirends opposing each other, a transverse lever arranged below the ends ofsaid longitudinal levers. and a coupling for connecting saidlongitudinal and transverse levers comprising nose irons arrangedrespectively on the ends of said longitudinal levers and each provided wth an up or transverse knife cdgc projecting lateral y from oppositesides of the respective longitudinal lever, two up )er hearin blocksarranged on o posite Sit es of each longitudinal lever am each providedwith an upper concave opposite the adjacent lower part of the upperknife edge and havi5 ing a lower convex face which is curvedtransversely, an upright strut provided with two pairs of upper concavefaces each of which is curved transversel and engages the convex face ofone of sad u per bearin hlocks and said strut being aso rovided with twolower concave faces whici are arranged on opposite sides of thetransverse lever and each of which is curved len hwise, two lowerbearing blocks arrange on opposite sides of said transverse lever andeach having a convex upper face which is curved lengthwise and engageswith one of the lower concave faces of the strut and each lower bearingblock also havin a lower concave face, and a lower longitu inal knifeedge arranged on the transverse lever and having its ends arranged onopposite sides of said transverse lever and each of said ends engagingits upper side with the con cave, lower face of tie adjacent lowerhearing block, each of said bearing blocks being provided on its concaveface with a wearing piece which engages with the adjacent art of therespective knife edge and wider is provided at its inner end with afriction point adapted to engage with the side of the adjacent member.

6. In a scale, the combination of two longitudinnl levers having theirends'opposing each other, a transverse lever arranged below the ends ofsaid longitudinal levers, and a coupling for connecting saidlongitudinal and transverse levers comprising nose irons arrangedrespectively" on the ends of said longitudinal levers and each rovidedwith an upper transverse knife e ge rejecting laterally from o positcsides of t ie respective longitudina lever, two paiis of upper hearingblocks arranged on op osite sides of each longitudinal lever an eachprovidcd With.- an upper concave seat engagin the adjacent lower part ofthen per kni e edge and having a lower convex ace which is c urvcdtransversely, an upright strut ro vidcd with two pairs of upper concavenccs each of which is curved transversely and engages the convex face ofone of said upper bearing blocks and said strut being also )rovidcd withtwo lower concave faces which are arranged on opposite sides of thetransverse lever and each of which is curved lengthwise. two lowerbearing blocks ar ranged on opposite sides of said transverse lever andeach having convexupper face which is curved lengthwise and-enga es withour of the lower concave faces of t e strut and each lower hearing blockalso having a lower concave face, and a lower longitudinu] knife edgearranged on the transverse lever and having its ends arranged onopposite sides of said transverse lever and each of said ends engagingits upper side with the concave lower face of the adjacent lovl'erbearing block, said strutccm rising two sections each-bf which is prcvied with one pair of said upper concave and one of said ower concavefaces, and atie connecting said sections.

7. In a scale, the combination of two longitudinal levers having theirends opposing each other a transverse lever arranged be low the en s ofsaid longitudinal levers, and a coupling for connecting saidlongitudinal and transverse levers comprising nose ironsarrangedrespectively. on the ends of said longitudinal levers andeacliflprovided with an up r transverse knife ge projecting lateral yfrom opposite sides of the respective longitudinal lever, two up rbearin blocks arranged on o posite si es of eac1 longitudinal lever aneach provided with .an upper concave face engaging the adjacent lowerpart of the upper knife edge and having a lower convex face which iscurved transversely, an upright strut provided with two pairs of upperconcave faces each of which is curved transversely and engages theconvex face of one ofsaid upper bearing blocks and said strut being alsoprovided with two lower concave faces which are arranged on oppositesides of the transverse lever and each of which is curved lengthwise,twolower bearin blocks arranged on op osite sides of said transverselever and eac having a convex upper face which is curved, lengthwise andengages with one of the lower concave faces of the said lower concavefac'es, and a tie connect ing said sections and comprisingan externallythreaded rod extending through openings in said strut sections, andscrew nuts arranged on said rod and bearing against opposite sides ofeach of said strut sections.

\ WILLIAM WALLACE BOYD.

